Caiano directed (as Allen Grünewald) and wrote the script for Nightmare Castle (Amanti d'oltretomba, 1965), which stars Barbara Steele.
The film stars Barbara Steele in dual lead roles, and its music was composed by Ennio Morricone.
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He also made several horror film appearances such as Nightmare Castle in 1965 alongside Barbara Steele, Paul Muller, Helga Liné, Laurence Clift and Rik Battaglia